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Robert J. Twieg
Researcher at Kent State University
Publications - 177
Citations - 6175
Robert J. Twieg is an academic researcher from Kent State University. The author has contributed to research in topics: Liquid crystal & Photorefractive effect. The author has an hindex of 42, co-authored 174 publications receiving 5785 citations. Previous affiliations of Robert J. Twieg include IBM & University of Michigan.
Papers
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Journal ArticleDOI
Observation of the photorefractive effect in a polymer.
TL;DR: The observation of the photorefractive effect in an amorphous electro-optic material, the nonlinear polymer bisphenol A diglycidyl ether 4-nitro-1,2,phenylenediamine (bisA-NPDA) make photoconductive by doping with the hole transport agent diethylaminobenzaldehyde-diphenyl hydrazone.
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Broadband terahertz characterization of the refractive index and absorption of some important polymeric and organic electro-optic materials
Paul D. Cunningham,Nestor N. Valdes,Felipe A. Vallejo,L. Michael Hayden,Brent M. Polishak,Xing-Hua Zhou,Jingdong Luo,Alex K.-Y. Jen,Jarrod Williams,Robert J. Twieg +9 more
TL;DR: In this paper, the authors report broad bandwidth, 0.1-10 THz time-domain spectroscopy of linear and electro-optic polymers for broadband THz applications.
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Nonlinear optical chromophores with large hyperpolarizabilities and enhanced thermal stabilities
Christopher R. Moylan,Robert J. Twieg,Victor Y. Lee,Sally Ann Swanson,K. Betterton,Robert D. Miller +5 more
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Investigation of two-photon absorption properties in branched alkene and alkyne chromophores.
Ajit Bhaskar,Guda Ramakrishna,Zhikuan Lu,Robert J. Twieg,Joel M. Hales,David J. Hagan,Eric W. Van Stryland,Theodore Goodson +7 more
TL;DR: It was found that, upon photoexcitation, there is an ultrafast charge localization to an intramolecular charge-transfer (ICT) state, followed by the presence of a solvent and conformationally relaxed ICT state in these branched systems.
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A photoactivatable push-pull fluorophore for single-molecule imaging in live cells.
Samuel J. Lord,Nicholas R. Conley,Hsiao-lu D. Lee,Reichel Samuel,Na Liu,Robert J. Twieg,W. E. Moerner +6 more
TL;DR: A red-emitting dicyanomethylenedihydrofuran push-pull fluorophore is reengineered so that it is dark until photoactivated with a short burst of low-intensity violet light, which provides a new class of bright photoactivatable fluorophores needed for super-resolution imaging schemes that require active control of single molecule emission.